2N2687 semiconductor manufactured by Sylvania, listed as 2N2687 (circa 1979).

2N2680A semiconductor manufactured by Sylvania, listed as 2N2680A (circa 1979).

2N2680 semiconductor manufactured by Sylvania, listed as 2N2680 (circa 1979).

2N2679 semiconductor manufactured by Sylvania, listed as 2N2679 (circa 1979).

2N2678 semiconductor manufactured by Sylvania, listed as 2N2678 (circa 1979).

2N2677 semiconductor manufactured by Sylvania, listed as 2N2677 (circa 1979).

2N2676 semiconductor manufactured by Sylvania, listed as 2N2676 (circa 1979).

2N2675 semiconductor manufactured by Sylvania, listed as 2N2675 (circa 1979).

2N2674 semiconductor manufactured by Sylvania, listed as 2N2674 (circa 1979).

2N2673 semiconductor manufactured by Sylvania, listed as 2N2673 (circa 1979).

2N2672A semiconductor manufactured by Sylvania, listed as 2N2672A (circa 1979).

2N2672 semiconductor manufactured by Sylvania, listed as 2N2672 (circa 1979).

2N2671 semiconductor manufactured by Sylvania, listed as 2N2671 (circa 1979).

2N2656 semiconductor manufactured by Sylvania, listed as 2N2656 (circa 1979).

2N2654 semiconductor manufactured by Sylvania, listed as 2N2654 (circa 1979).

2N2653 semiconductor manufactured by Sylvania, listed as 2N2653 (circa 1979).

2N2651 semiconductor manufactured by Sylvania, listed as 2N2651 (circa 1979).

2N2648 semiconductor manufactured by Sylvania, listed as 2N2648 (circa 1979).

2N2647 semiconductor manufactured by Sylvania, listed as 2N2647 (circa 1979).

2N2646 semiconductor manufactured by Sylvania, listed as 2N2646 (circa 1979).